Just for fun: Cartwheel armbar

Okay:
1. Yes, I do pull this off randomly.
2. I did not go into great detail because I figured it was fairly self explanatory for experienced folks.
3. No, I would never use this as a go to maneuver but it's fun to do.

I use a close variation of this when kicking over from a failed Kimura.

Opponent will defend the Kimura, I kick my far leg over the near arm, hook on the hip (their arm is between my legs now), roll over my shoulder, and sweep just like in your video. Works really well if they keep pressure down on me, but fails if they posture hard and I don't have a lock down on their arm (end up with them in my guard).